build(deps): bump r-efi from 2.2.0 to 3.1.0

Bumps [r-efi](https://github.com/r-efi/r-efi) from 2.2.0 to 3.1.0.
- [Release notes](https://github.com/r-efi/r-efi/releases)
- [Changelog](https://github.com/r-efi/r-efi/blob/master/NEWS.md)
- [Commits](https://github.com/r-efi/r-efi/commits)

Signed-off-by: dependabot-preview[bot] <support@dependabot.com>

Author: dependabot-preview[bot]

Cargo.lock

@@ -28,7 +28,7 @@ integration_tests = []
 bitflags = "1.2"
 x86_64 = "0.12.2"
 atomic_refcell = "0.1"
-r-efi = "2.1.0"
+r-efi = "3.1.0"
 uart_16550 = "0.2.10"
 
 [dev-dependencies]